| | Chemical Composition | Mechanical Properties | Related Specifications | ||||||||||||||||
| General Information | C | Si | Mn | Ni | Cr | Mo | Va | S | P | Tensile Strength | Yield Stress | 0.2% Proof | Elong- ation | Izod | Brinell No: | BS | SAE | ||
| Spec BS970 | Type of Steel | Cond- ition | % | % | % | % | % | % | % | % | % | Tons / Sq In Min | Tons / Sq In Min | Tons / Sq In Min | % Min | Ft Lb Min | No:- | No:- | No:- |
| En 1A | Free Cutting Mild Steel | Cold Rolled or Drawn | 0.07 to 0.15 % | 0.10 % max | 0.80 to 1.20 % | -- | -- | -- | -- | 0.20 to 0.30 % | 0.07 % max | -- | -- | -- | 10 to 26 a) | -- | -- | 32/4 | -- |
| En 1B | Free Cutting Mild Steel | Cold Rolled or Drawn | 0.07 to 0.15 % | 0.10 % max | 1.00 to 1.40 % | -- | -- | -- | -- | 0.30 to 0.60 % | 0.06 % max | 23 to 27 a) | -- | -- | 10 to 24 a) | -- | -- | 32/5 | -- |
| En 2 b) | G/Purp Cold Forming Steel | Rolled or Forged | 0.20 % max | -- | 0.80 max | -- | -- | -- | -- | 0.06 % max | 0.06 % max | 20 | -- | -- | 28 | -- | -- | 1449 1627 29 | 1016 1019 |
| En 2A | Sp/Purp Cold Forming Steel | STCO c) | 0.12 max | -- | 0.50 max | -- | -- | -- | -- | 0.05 max | 0.05 max | -- | -- | -- | -- | -- | -- | 1449 1627 | 1006 1010 |
| En 2A/1 | Sp/Purp Cold Forming Steel | STCO c) | 0.10 max | -- | 0.50 max | -- | -- | -- | -- | 0.04 max | 0.04 max | -- | -- | -- | -- | -- | -- | 1449 | 1006 1008 |
| En 2B | Sp/Purp Cold Forming Steel | STCO c) | 0.15 max | -- | 0.50 max | -- | -- | -- | -- | 0.05 max | 0.05 max | -- | -- | -- | -- | -- | -- | 1449 1627 | 1006 1012 |
| En 2C | Sp/Purp Cold Forming Steel | As Rolled or Forged | 0.15 to 0.25 max | -- | 0.40 to 0.60 max | -- | -- | -- | -- | 0.05 max | 0.05 max | -- | -- | -- | -- | -- | -- | 1449 | 1017 1020 |
| En 2D | Sp/Purp Cold Forming Steel | As Rolled or Forged | 0.15 to 0.30 max | -- | 0.40 to 0.70 max | -- | -- | -- | -- | 0.05 max | 0.05 max | -- | -- | -- | -- | -- | -- | 1449 | 1017 1020 1025 |
| En 2E | Cold Forming Fully Killed | As Rolled or Forged | 0.15 max | 0.10 to 0.35 max | 0.50 max | -- | -- | -- | -- | 0.06 max | 0.06 max | -- | -- | -- | -- | -- | -- | -- | 1009 |
| En 3 | '20' Carbon Steel | As Rolled or Forged | 0.25 max | 0.05 to 0.35 max | 1.00 max | -- | -- | -- | -- | 0.06 max | 0.06 max | -- | -- | -- | -- | -- | -- | 14, 29 400 1506 /102 | 1017 1022 |
| En 3A | '20' Carbon Steel | As Rolled/ Norma- lised | 0.15 to 0.25 | 0.05 to 0.35 | 0.40 to 0.90 | -- | -- | -- | -- | 0.06 max | 0.06 max | 28 | -- | -- | 25 | -- | -- | 14,29 32/2 400 1506/ 101 | 1017 1022 |
| En 3C | '20' Carbon Steel | As Rolled/ Norma- lised | 0.17 to 0.23 | 0.05 to 0.35 | 0.60 to 1.00 | -- | -- | -- | -- | 0.05 max | 0.05 max | 28 | -- | -- | 25 | -- | -- | 14,29 400 1506/ 101 | 1022 |
| En 3B | '20' Carbon Steel | Cold Drawn | 0.25 max | 0.35 max | 1.00 max | -- | -- | -- | -- | 0.06 max | 0.06 max | 28 | -- | -- | 17 | -- | -- | 32/2 1506/ 121 | 1017 1022 |
| En 3D | '20' Carbon Steel | Cold Drawn | 0.15 to 0.25 | 0.05 to 0.35 | 0.60 to 1.00 | -- | -- | -- | -- | 0.06 max | 0.06 max | 28 to 35 a) | -- | -- | 15 | -- | -- | 14,29 32/2 400 1506/ 101 | 1017 1022 |
| En 4 | '25' Carbon Steel | Norma- lised | 0.30 max | 0.05 to 0.35 | 1.00 max | -- | -- | -- | -- | 0.06 max | 0.06 max | 28 to 38 | -- | -- | 25 | -- | 126 to 179 | 1503/ 151 | 1025 |
| En 4A | '25' Carbon Steel | Cold Drawn | 0.30 max | 0.05 to 0.35 | 1.00 max | -- | -- | -- | --- | 0.06 max | 0.06 max | 32 to 42 | -- | -- | 12 | -- | -- | -- | 1025 1026 |
| En 5 | '30' Carbon Steel | Norma- lised | 0.25 to 0.35 | 0.05 to 0.35 | 0.06 to 1.00 | -- | -- | -- | -- | 0.06 max | 0.06 max | 32 | 16 | -- | 25 | 20 | 143 to 193 | 1449 29 | 1026 1030 1033 |
| En 5K d) | '30' Carbon Steel | Norma- lised | 0.25 to 0.35 | 0.05 to 0.35 | 0.60 to 1.00 | -- | -- | -- | -- | 0.05 max | 0.05 max | 32 | 16 | -- | 25 | 20 | 143 to 193 | 1449 | 1030 |
| En 5A | '30' Carbon Steel | STCO c) | 0.25 to 0.30 | 0.05 to 0.35 | 0.70 to 0.90 | -- | -- | -- | -- | 0.06 max | 0.06 max | -- | -- | -- | 25 | 20 | -- | 1449 | 1026 1030 |
| En 5B | '30' Carbon Steel | STCO c) | 0.28 to 0.33 | 0.05 to 0.35 | 0.70 to 0.90 | -- | -- | -- | -- | 0.06 max | 0.06 max | -- | -- | -- | -- | -- | -- | 1449 | 1030 |
| En 5C | '30' Carbon Steel | STCO c) | 0.30 to 0.35 | 0.05 to 0.35 | 0.70 to 0.90 | -- | -- | -- | -- | 0.06 max | 0.06 max | -- | -- | -- | -- | -- | -- | 1449 | 1033 |
| En 5D | '30' Carbon Steel | Hardened Tempered +Cold Drawn | 0.25 to 0.35 | 0.05 to 0.35 | 0.60 to 1.00 | -- | -- | -- | -- | 0.06 max | 0.06 max | 35 to 45 a) | -- | -- | 15 to 20 | 10 to 40 | 229 to 255 | 1449 | 1026 1030 1033 |
| En 6 | Med. Carbon Steel | Bright | 0.40 max | 0.05 to 0.35 | 0.50 to 0.90 | -- | -- | -- | -- | 0.06 max | 0.06 max | 38 to 48 a) | -- | -- | 10 to 12 a) | 15 to 20 | -- | -- | 1035 |
| En 6K | Medium Carbon Steel | Bright | 0.40 max | 0.05 to 0.35 | 0.50 to 0.90 | -- | -- | -- | -- | 0.05 max | 0.05 max | 35 to 45 a) | -- | -- | 12 to 15 a) | 10 | -- | 32/1 | 1035 |
| En 6A | Medium Carbon Steel | Bright | 0.40 max | 0.05 to 0.35 | 0.50 to 0.90 | -- | -- | -- | -- | 0.06 max | 0.06 max | 32 to 48 a) | -- | -- | 10 | -- | -- | 32/1 46/1 | 1035 |
| En 7 | Semi Free- Cutting C/Steel | Cold Drawn | 0.10 to 0.30 | 0.25 max | 0.70 to 1.30 | -- | -- | -- | -- | 0.10 to 0.18 | 0.06 max | 30 to 50 a) | -- | -- | 12 to 15 a) | -- | -- | 32/1 46/1 | 1115 |